Dreamsome#63

原始数据:

L1 cache reference = 0.5 ns
Branch mispredict = 5 ns
L2 cache reference = 7 ns
Mutex lock/unlock = 25 ns
Main memory reference = 100 ns        
Compress 1K bytes with Zippy = 3 µs
Send 2K bytes over 1 Gbps network = 20 µs
SSD random read = 150 µs
Read 1 MB sequentially from memory = 250 µs
Round trip within same datacenter =  0.5 ms
Read 1 MB sequentially from SSD* = 1 ms
Disk seek = 10 ms
Read 1 MB sequentially from disk = 20 ms
Send packet CA->Netherlands->CA = 150 ms

最早的出处应该是 Peter Norvig 的这篇文章

这儿还有一个交互式版本



Published

27 February 2015

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